The NAS4Free operating system can be installed on virtually any hardware platform to share computer data storage over a computer network. Thanks to the modular design of the framework it can be enhanced via plugins. It is a simple and easy to use out-of-the-box solution that will allow everyone to install and administer a Network Attached Storage without deeper knowledge. Openfiler ensures that storage administrators are able to make the best use of system performance and storage capacity resources when allocating and managing storage in a multi-platform network.
Openfiler provides key features such as iSCSI target for virtualization, Fibre Channel target support, block level replication and High Availability that are the mainstay of any business critical storage environment. Openfiler addresses all the key data storage concerns:. Because RAID 0 spreads storage blocks across all of the disks in the array, any disk failure will result in the entire array being lost.
As such, the risk of data loss due to a drive fault will also scale with the number of disks within the array. We do not recommend using a RAID 0 for production systems. Each time a data block is written to the storage subsystem, your RAID controller will write that same data block on both disks, providing fault tolerance should one of the disks fail. This is because when the RAID controller needs to write data it has to do so on both disks, however, when it needs to read data it can simultaneously fetch two different reads from either disk since the data set on both disks is mirrored.
Because the data is mirrored on both disks in the array, either one of the disks can fail, as log as one remains functional, without causing the array to fail. In these cases, write performance will slightly degrade as the number of disks increase and the read performance will scale with the number of disks. With a RAID 5 array, there will be one parity set distributed across the array, which allows for any one disk in the array to fail without causing the array to fail. Because the distributed parity needs to contain parity information for one disks worth of information, the raw space provided by the array will be the total capacity of all of the disks minus one disks worth of capacity.
For big data operations such as server farms and data centers however, where budgets will be bigger and performance more important, RAID 10 still offers the most benefits. In addition, the prices of hard drives and solid state drives have dropped significantly in the last few years, so expanding a RAID 10 array can be accomplished at lower cost than ever before. Setting up a RAID array can be done one of two ways: hardware or software.
You can purchase storage appliances , RAID expansion cards , and select motherboards specifically designed to support RAID arrays, and those often include additional features and functions that make management easier. So when a drive fails, it can be quickly replaced without powering down the devices. From a user standpoint, there will be minimal downtime. In addition, setup and management of RAID configurations are made easier with a hardware solution—especially with desktop appliances and enclosures.
Some cloud models feature management portals that can be accessed via IP from within the network or from an online management portal if outside the network. Most hardware- and software-based RAID systems support this type of array. When you write data to what appears to be a single drive, you actually write it to two or more disks. This level offers data recoverability, but it comes at the cost of performance, since every disk action occurs multiple times.
Once again, both hardware and software systems usually support this type of array. RAID 5 stripes data across multiple disks like RAID 0 while maintaining a system of parity blocks that allow the array to know what data is on each physical disk, even if a disk is lost due to malfunction.
This level requires at least three physical disks. In addition, you lose a portion of your space in order for the system to save the parity data and recover lost data in case of failure. RAID 10 involves mirroring a striped disk set to another striped disk set. Once again, you'll most likely want to use hardware-based controllers rather than software RAID systems.
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